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I upgraded from Windows7 Beta to the RC today. Microsoft wants a clean install, but I decided to try this hack I found at Life Rocks 2.0.

It’s really pretty straight forward.

1 Download the ISO and burn the ISO to a DVD.

2 Copy the whole image to a storage location you wish to run the upgrade from (a bootable flash drive or a directory on any partition on the machine running the pre-release build).

3 Browse to the sources directory.

4 Open the file cversion.ini in a text editor like Notepad.

5 Modify the MinClient build number to a value lower than the down-level build. You need to change the value to 7000 as it is the beta version build number.

6 Save the file in place with the same name.

7 Run setup like you would normally from this modified copy of the image and the version check will be bypassed.

1 Download the ISO and burn the ISO to a DVD.

2 Copy the whole image to a storage location you wish to run the upgrade from (a bootable flash drive or a directory on any partition on the machine running the pre-release build).

3 Browse to the sources directory.

4 Open the file cversion.ini in a text editor like Notepad.

5 Modify the MinClient build number to a value lower than the down-level build. You need to change the value to 7000 as it is the beta version build number.

6 Save the file in place with the same name.

7 Run setup like you would normally from this modified copy of the image and the version check will be bypassed.

I had already burned a boot DVD from the RC ISO, so I just copied that on a 8 gig thumb drive, and modifed the file in question. I then plugged that drive in my Windows7 Beta system and ran setup.exe from the thumb drive.

The only hitch was that RC didn’t like the $25 sound card I had installed to work with the BETA release. I’ll check for updated drivers later.